Abstract
The lithiated metallocenes ruthenocene (C 5H 5) 2Ru and 1,1′ -dimethylferrocene (C 5H 4CH 3) 2Fe react with the metal hexacarbonyls of Group VIB to yield acylato complexes, from which, by subsequent alkylation with [Et 3O][BF 4], the corresponding pentacarbonylethoxyrunthenocenylcarbene (I—III) as well as pentacarbonylethoxydimethylferrocenylcarbene complexes (IV—VI) of chromium, molybdenum and tungsten are obtained. The reaction of the new tungsten complexes III + VI with boron and aluminium halides (MX 3; X = Cl, Br) at low temperatures yields trans-halogenotetracarbonylruthenocenylcarbyne (VII, VIII) and trans-bromotetracarbonyldimethylferrocenylcarbyne complexes (IX). The reaction conditions, the results of spectroscopic and electrochemical measurements, compared to previously discussed ferrocenylcarbene- and -carbyne complexes and the X-ray structure of III are reported.
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